Java Interview Questions · interview question

Which practice avoids a common mistake with Optional?

Multiple choiceMediumjava-interview-2026interviewjavapitfall

Silence the Optional problem by using raw types, broad catches, or shared mutable state.Do not fill entities, DTOs, or every parameter with Optional just to avoid thinking about API boundaries carefully.Prefer the version of Optional that makes behavior less predictable as long as the code compiles.Ignore the Optional issue and rely on team discipline instead of APIs or contracts.

Answer and explanation

Correct answer

B. Do not fill entities, DTOs, or every parameter with Optional just to avoid thinking about API boundaries carefully.

Why

Do not fill entities, DTOs, or every parameter with Optional just to avoid thinking about API boundaries carefully. This is a common failure mode in real Java code and a frequent interview follow-up.

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Which practice avoids a common mistake with Optional?

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